Śatapatha Brāhmaṇa ("of a hundred paths") 14.1.2.8

14.1.2.8

tāṃ savye pāṇau kṛtvā dakṣiṇenābhimṛśya japati yuñjate mana uta yuñjate dhiyo viprā viprasya bṛhato vipaścitaḥ vi hotrā dadhe vayunāvideka inmahī devasya savituḥ pariṣṭutirityasāveva bandhuḥ

Having placed it in his left hand, he touches it with the right, and mutters (Vâg. S. XXXVII, 2), 'They harness the mind, and they harness the thoughts, the priests of the priest, of the great inspirer of devotion; the knower of the rites alone hath assigned the priestly offices: great is the praise of the god Savitri;'--the import of this is the same as before.